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You searched for subject:( modifier addition). Showing records 1 – 3 of 3 total matches.

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University of Ottawa

1. Meskar, Mahmoud. Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology .

Degree: 2018, University of Ottawa

In Canada, about 60% of contaminated sites involve petroleum hydrocarbon (PHC) contamination and most of these sites have been abandoned due to contamination. Among current technologies used for soil remediation, supercritical fluid extraction (SFE) is a relatively recent and potentially viable method. The main aim of this research was to investigate the application of SFE for removal of PHCs from contaminated soils. In the first phase, the effects of SFE operational parameters including fluid pressure, fluid temperature, time duration and mode of extraction on the removal efficiency of PHCs from a spiked sandy soil (with diesel fuel with a ratio of 5 wt%) were investigated. SFE experiments were performed at different pressures (15, 33 and 50 MPa) and temperatures (30, 75 and 120 °C). The combination of 10 min static mode followed by 10 min dynamic mode, repeated for 3 cycles (60 min in total) led to the highest PHC removal percentage. According to response surface methodology (RSM), the optimum pressure and temperature were found to be 50 MPa and 69.3 °C, respectively. According to experimental results, the optimum combination of pressure and temperature determined to be 33 MPa and 75 °C; which resulted in the extraction percentages of 99.2%, 91.7% and 86.1% for PHC F2, F3 and F4 fractions, respectively. In the second phase, the influence of several parameters including soil water content, soil pH and addition of modifier on PHCs removals from a field-contaminated sandy soil using SFE were experimentally investigated. SFE experiments were performed at 33 MPa pressure and temperatures of 45 and 75 °C. Three water content levels of 8%, 14% and 20% at two levels of pH 6.5 and 7.5 were investigated. The extraction of total petroleum hydrocarbon fractions (TPHF), the sum of F2, F3, and F4 fractions, decreased due to the increase in the water content from 8% to 20% at both pH 6.5 and 7.5. The difference of extractions of all PHC fractions at pH values of 6.5 and 7.5 were not statistically significant (at p < 0.05 confidence level) at all three water content levels and pH did not have a significant influence on the PHC removal efficiency. Addition of acetone as a modifier (33.7% TPHF removal) was more effective than hexanes (24.3% TPHF removal) to decrease the concentrations of PHCs for the field contaminated soil. In the third phase, the influence of soil texture and grain size on the extraction of PHC fractions was investigated. SFE experiments were performed at 33 MPa pressure and 75 °C temperature. Three types of soils (soil A, B and C) were spiked with diesel fuel with a ratio of 5 wt%. Soil A, B and C had different particle sizes and were categorized as sand, silt loam and clay, respectively. Soil A (sand) which had the largest particle size resulted in the highest TPHF removal percentage while soil C (clay) with the smallest particle size led to the lowest TPHF removal percentage. A higher clay content in soil C resulted in a lower extraction of PHCs. In the fourth phase, the effects of pressure and temperature…

Subjects/Keywords: petroleum hydrocarbon; supercritical fluid extraction; contaminated soil; soil remediation; sand; clay; soil pH; water content; modifier addition; soil grain size; response surface methodology; optimization; statistical analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Meskar, M. (2018). Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/37393

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Meskar, Mahmoud. “Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology .” 2018. Thesis, University of Ottawa. Accessed November 21, 2019. http://hdl.handle.net/10393/37393.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Meskar, Mahmoud. “Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology .” 2018. Web. 21 Nov 2019.

Vancouver:

Meskar M. Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology . [Internet] [Thesis]. University of Ottawa; 2018. [cited 2019 Nov 21]. Available from: http://hdl.handle.net/10393/37393.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Meskar M. Treatment of Petroleum Contaminated Soil using Supercritical Fluid Extraction (SFE) Technology . [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/37393

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Brno University of Technology

2. Záruba, Jiří. Vývoj požárně odolných správkových malt s jemnozrnným plnivem .

Degree: 2015, Brno University of Technology

Diplomová práce je zaměřena na požárně odolné správkové malty s jemnozrnným plnivem. Cílem této práce je výzkum a vývoj jemnozrnné správkové malty odolné vůči vysokým teplotám, jež jsou charakteristické při vzniku požáru. Byly využity teoretické poznatky s následně realizovaným laboratorním ověřením. Pozornost byla věnována hmotám na bázi směsného pojiva obsahujícího cement a vysokopecní strusku, resp. vy-sokoteplotní popílek. Jako rozptýlená výztuž byla použita celulózová vlákna. Posuzová-ny byly dva druhy kameniv – popílkový agloporit a amfibolit vč. jejich kombinací. La-boratorní testy probíhaly formou stanovení základních materiálových vlastností (obje-mová hmotnost, pevnosti, soudržnost, rozměrové změny atd.) po expozici při extrémních teplotách. Podstatnou částí výzkumu bylo také studium rozdílných podmínek chlazení – pozvolné a dále rychlé (ve vodě a na vzduchu). Vybrané receptury byly namáhány teplotou až do 1200 °C. V závěru práce je vybráno několik receptur, které byly na základě výsledků a zjištění shledány jako optimální pro navazující výzkum.; The diploma thesis is focused on fire-resistant repair mortar with fine-grained filler. The aim of this work is the research and development of fine-grained Mortars resistant to high temperatures, which are characteristic at the beginning of the fire. The theoretical knowledge with subsequently realized laboratory verification was used. At-tention was paid to the masses based on the mixed binder comprising cement and blast furnace slag, respectively. high-temperature ash. Cellulose fibres were used as the dis-persed reinforcement. Two kinds of aggregate were assessed - fly ash agloporit and am-phibolite incl. combinations thereof. Laboratory tests were carried out via determination of basic material properties (density, strength, consistency, dimensional changes etc.) after exposure to extreme temperatures. A substantial part of the research was also study of different cooling conditions - slow and fast (water and air). Selected formulations were subjected to temperatures up to 1200 ° C. In the conclusion is selected several recipes that have been found to be optimal for continuing research on the basis of the results and findings. Advisors/Committee Members: Bydžovský, Jiří (advisor).

Subjects/Keywords: správkové hmoty; příměsi; lehké kamenivo; alternativní suroviny; směsné pojivo; rozptýlená výztuž; polymerní modifikátor; fyzikálně-mechanické parametry; teplotní zatížení; pozvolné a šokové chlazení; repair mortars; addition agent; lightweight aggregate; alternative raw materials; blended binder; dispersed reinforcement; polymer modifier; physico-mechanical parameters; thermal load; slow and fast cooling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Záruba, J. (2015). Vývoj požárně odolných správkových malt s jemnozrnným plnivem . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/37715

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Záruba, Jiří. “Vývoj požárně odolných správkových malt s jemnozrnným plnivem .” 2015. Thesis, Brno University of Technology. Accessed November 21, 2019. http://hdl.handle.net/11012/37715.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Záruba, Jiří. “Vývoj požárně odolných správkových malt s jemnozrnným plnivem .” 2015. Web. 21 Nov 2019.

Vancouver:

Záruba J. Vývoj požárně odolných správkových malt s jemnozrnným plnivem . [Internet] [Thesis]. Brno University of Technology; 2015. [cited 2019 Nov 21]. Available from: http://hdl.handle.net/11012/37715.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Záruba J. Vývoj požárně odolných správkových malt s jemnozrnným plnivem . [Thesis]. Brno University of Technology; 2015. Available from: http://hdl.handle.net/11012/37715

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Brno University of Technology

3. Zaťko, Petr. Vliv rozptýlené výztuže na průběh zrání polymercementových hmot .

Degree: 2017, Brno University of Technology

Diplomová práce je zaměřena na polymercementové hmoty s rozptýlenou výztuží. Cílem této práce je navrhnout vhodnou recepturu polymercementové malty a sledování vlivu rozptýlené výztuže na průběh zrání těchto hmot a fyzikálně-mechanické vlastnosti. Také je sledován vliv působení vysokých teplot na vlastnosti této malty. Důraz je kladen na využití alternativních surovinových zdrojů a vedlejších produktů. Bylo použito směsné pojivo z cementu a strusky a příměsí z mikrosiliky. Jako rozptýlená výztuž byla zvolena vlákna na bázi recyklované celulózy a byla srovnána s komerčními polypropylenovými vlákny.; The diploma thesis is focused on polymercement materials with dispersed reinforcement. The aim of this work is development of suitable polymercement mixture and monitoring of the impact of dispersed reinforcement on the course of maturation of these materials and physico-mechanical properties. The effect of high temperatures on the properties of the mortar is also examined. Emphasis is placed on the use of alternative resources and byproducts. Mixed binder of cement and slag and admixture of microsilica was used. Recycled cellulose was used as dispersed reinforcement and was compared with commercial polypropylene fibers. Advisors/Committee Members: Bydžovský, Jiří (advisor).

Subjects/Keywords: Polymercementové hmoty; cement; směsné pojivo; příměsi; alternativní suroviny; rozptýlená výztuž; polymerní modifikátor; zrání; fyzikálně-mechanické parametry; teplotní zatížení; rozměrové změny; recyklovaná celulóza.; Polymercement materials; cement; blended binder; addition agent; alternative raw materials; dispersed reinforcement; polymer modifier; maturing; physico-mechanical parameters; thermal load; dimensional changes; recycled cellulose.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zaťko, P. (2017). Vliv rozptýlené výztuže na průběh zrání polymercementových hmot . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/64292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Zaťko, Petr. “Vliv rozptýlené výztuže na průběh zrání polymercementových hmot .” 2017. Thesis, Brno University of Technology. Accessed November 21, 2019. http://hdl.handle.net/11012/64292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Zaťko, Petr. “Vliv rozptýlené výztuže na průběh zrání polymercementových hmot .” 2017. Web. 21 Nov 2019.

Vancouver:

Zaťko P. Vliv rozptýlené výztuže na průběh zrání polymercementových hmot . [Internet] [Thesis]. Brno University of Technology; 2017. [cited 2019 Nov 21]. Available from: http://hdl.handle.net/11012/64292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zaťko P. Vliv rozptýlené výztuže na průběh zrání polymercementových hmot . [Thesis]. Brno University of Technology; 2017. Available from: http://hdl.handle.net/11012/64292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.